John schwarzmann



(No Model.)

J- SCHWARZMANN. ROTARY ENGINE.

No. 450,874. P'fltel1'edAprr 21,1891.

; W A Aga? I UNITED STATES PATENT OFFICE.

JOHN SOHVARZMANN, OF \VASI:lING'l`ON, DISTRICT OF COLUMBIA.

RoTARY ENGINE.

SPECIFICATION forming' part of Letters Patent No. 450,874, dated April21. 1891.

Application filed August '7, 1890. Serial No. 361y258. (No model.)

To a/ZZ who-m, it' may conccrn:

Be it known that I, JOHN SCH\\"ARZ.\'IANN, a subject of the Emperor ofGermany, and a resident of lVashington, in the District of Columbia,have invented certain new and useful lmprovements in Rotary Engines; andI do hereby declare that the following is a full, clear, and exactdescription of the invention,which will enable others skilled in the artto which it appertains to make and use the same, reference being had tothe aceompanyinr drawings, which form a part of this specification.

My invention relatcs to improvements in rotary steam-engines; and itsobject is to provide such an engine which shall be simple and economicalin construction and efficient and reliable in use and which is notliable t-o get out of order.

The invention consists in the novel construction and combination ofparts hereinafter fully described, and definitely pointed out in theclaims.

In the accompanying drawings, Figure lis a side elevation of a rotaryengine constructed in accordance with my invention. Fig. 2 is a centrallongitudinal section of the same. Fig. 3 is a face View of the piston.Fig. 4 is a similar View of the steam-chest.

In the said drawings the referencc-numeral l designates thebase of theengine, which also forms the eXhaust-chamber. Mounted upon this base aretwo uprights 2, in which is journaled thedriving-shaft which carries thepiston.

The engine proper consists of a cylinder or casing composed of the rim 3and the heads 4. The lower portion of this cylinder rests upon the base1, and the rim is provided with an eXhaust-opening` 5. In thecylinder-heads are the steam-chests 6. These may be formed by makingeach head of two annular disks united at their peripheries, Whereby anannular space is provided. This construction, however, may be varied, solong` as the object thereof is attained, which is the provision of asteam-chest in the cylinder-head.

The numeral 7 designates the steam-supply pipe communicating with thesteam-chest. At each side of the cylinder-head and forming a part of thesteam-chest are outwardlyextending square or other suitably-shapedprojections S. On the inner face of the cylinder-head is a series ofsteam-ports 9. These ports consist of openings extending' from thecorners of the projection 8 to nearthe periphery of the steam-Ghost,with an overlapping part or piece 9" so arranged that the steam willissue from said openings 01' ports in lines tangential to the axis ofthe drivdng-shaft, which passes through the cylinder-heads.

The numerallO designates thepiston mounted upon the driving-shaft 12,which passes through the cylinder-heads and is journaled in the uprights2, as before stated. On one or both faces of the piston are formed anumber of grooves 13, arranged in series, and the grooves of each seriesbeing tangential to the axis of the shaft and coinciding and registeringwith the ports in the steam-chests. These grooves extend from near thecenter to the periphery of the piston, their outer ends being closed bythe rim 13' encircling the piston. As seen in Figs. 2 and 3, thesegroove-s are of peculiar form, one of the sides thereof beingbeveled,while the ogposite side is plain or concaved, so as to form bucketswhich catch the steam issuing,` from the steam-ports. The number of theseries of grooves should correspond with the number of steam-ports inthe drawings, four of such ports being` shown and four groups ofgrooves, each of which is composed of three grooves. The number,however, may be varied, as may be found best suited for the work.

I have illustrated the engine as having steam-ports in eachcylinder-head and corresponding grooves upon both faces of the piston;but it is obvious that they may be used upon one side only. It is alsoobvious that the ports and grooves upon one side may be arranged inreverse order to throw on the other side, so that the engine maybereversed.

The operation is as follows: -Steam being` admitted to the steam-chestfrom any suitable source, it escapes through the steamports in the innerface thereof in a line tangential to the axis of the piston-shaft, and,striking the beveled sides of the grooves, is directed against theopposite side thereof, causing the piston and its shaft to be rotated.

It will be seen that there is a space left between the piston and thesteam-chest between the steam-ports which will allow the steam to IOOescape into the space between the rim of the cylinder' and the pistonand finally discharge into the eXhaust-chamber through theexhaust-ports.

Having thus described my invention, what I clairn is- 1. In a rotaryengine, the combination, with a casing or cylinder having a steam-chestlocated in the head thereof, said ohest being,r provided With asteam-inlet and the ports discharging into the cylinder in a linetangential to the-axis thereof, of a driving'shaft passing through saidcylindei` and having a piston mounted thereon, the face (of which isprovided with a number of grooves arranged vin series 'andcoincidingandregisteringiwith the stealn-'ports and exha'ust-ports insaid cyl- '-inder,- substanti'ally as described.

52.7 In a'rotary engine,`the combination, With a casing or cylinderhaving arsteanrchest lo` cated in Vthe head thereof, said' chest' beingprovided with a steam-inlet and the ports vdisohai'ging into' thecylinder in a line fangential to the axis thereof, of a driving-shaft:carryinga piston havinga series of ,grooves coinciding and registeringwith said steamports, said grooves being. beveled upon one side, anexhaust-chamber in the base of the engine, and exhaust portscoinmunicating therewith, substantially as desoribed.

v-In testimonyv that I'claim: Vthe foregoing' as my own I have hereuntoaffixed my signature 'in 'presen'cef of two Witnesses.

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